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<h1>Inverse Adjacency Iterator Adaptor</h1>

Defined in header
<a href="../../../boost/graph/adjacency_iterator.hpp">boost/graph/adjacency_iterator.hpp</a>

<p>
The inverse adjacency iterator adaptor transforms an
<tt>in_edge_iterator</tt> into an inverse adjacency iterator. That is, it
takes an iterator that traverses over edges, and creates an iterator
that traverses over the <b><i>source</i></b> vertices of those edges.

<!--
With this adaptor it is trivial to take a graph type that models <a
href="IncidenceGraph.html">Incidence Graph</a> and add the
capabilities required of <a href="AdjacencyGraph.html">Adjacency
Graph</a>. -->


<h2>Synopsis</h2>

<pre>
namespace boost {
  template &lt;class Graph, class VertexDescriptor, class InEdgeIter&gt;
  class inv_adjacency_iterator_generator {
  public:
    typedef <a href="../../iterator/doc/iterator_adaptor.html">iterator_adaptor</a>&lt;...&gt; type;
  };
}
</pre>

<hr>

<h3>Example</h3>

<p>
The following is an example of how to use the
<tt>inv_adjacency_iterator_generator</tt> class.

<p>
<PRE>
#include &lt;boost/graph/adjacency_iterator.hpp&gt;

class my_graph {
  // ...
  typedef ... in_edge_iterator;
  typedef ... vertex_descriptor;
  typedef boost::inv_adjacency_iterator_generator&lt;my_graph, vertex_descriptor, in_edge_iterator&gt;::type inv_adjacency_iterator;
  // ...
};

</PRE>

<h3>Template Parameters</h3>

<Table border>
<TR>
<TH>Parameter</TH><TH>Description</TH>
</TR>

<TR>
<TD><tt>Graph</tt></TD>
<TD>The graph type, which must model <a
href="./IncidenceGraph.html">Incidence Graph</a>.</TD>
</TR>

<TR>
<TD><tt>VertexDescriptor</tt></TD>
<TD>This must be the same type as
<tt>graph_traits&lt;Graph&gt;::vertex_descriptor</tt>.  The reason why
this is a template parameter is that the primary use of
<tt>inv_adjacency_iterator_generator</tt> is <b><i>inside</i></b> the
definition of the graph class, and in that context we can not use
<tt>graph_traits</tt> on the not yet fully defined graph class.<br>
<b>Default:</b> <tt>graph_traits&lt;Graph&gt;::vertex_descriptor</tt></TD>
</TR>

<TR>
<TD><tt>InEdgeIter</tt></TD>
<TD>This must be the same type as
<tt>graph_traits&lt;Graph&gt;::in_edge_iterator</tt>.<br>
<b>Default:</b> <tt>graph_traits&lt;Graph&gt;::in_edge_iterator
</TD>
</TR>

</Table>

<h3>Model of</h3>

The inverse adjacency iterator adaptor (the type
<tt>inv_adjacency_iterator_generator<...>::type</tt>) is a model of <a
href="../../utility/MultiPassInputIterator.html">Multi-Pass Input Iterator</a>
</a>.


<h3>Members</h3>

The inverse adjacency iterator type implements the member functions and
operators required of the <a
href="http://www.boost.org/sgi/stl/RandomAccessIterator.html">Random Access Iterator</a>
concept, except that the <tt>reference</tt> type is the same as the <tt>value_type</tt>
so <tt>operator*()</tt> returns by-value. In addition it has the following constructor:

<pre>
inv_adjacency_iterator_generator::type(const InEdgeIter&amp; it, const Graph* g)
</pre>

<hr>
<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan -->19 Aug 2001<!--webbot bot="Timestamp" endspan i-checksum="14767" --></p>
<p>© Copyright Jeremy Siek 2000. Permission to copy, use,
modify, sell and distribute this document is granted provided this copyright
notice appears in all copies. This document is provided &quot;as is&quot;
without express or implied warranty, and with no claim as to its suitability for
any purpose.</p>

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